layout/generic/WBRFrame.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 /* rendering object for HTML <wbr> elements */
   8
   9 #include "mozilla/PresShell.h"
  10 #include "nsHTMLParts.h"
  11 #include "nsIFrame.h"
  12
  13 using namespace mozilla;
  14
  15 namespace mozilla {
  16
  17 class WBRFrame final : public nsIFrame {
  18  public:
  19   NS_DECL_FRAMEARENA_HELPERS(WBRFrame)
  20
  21   friend nsIFrame* ::NS_NewWBRFrame(mozilla::PresShell* aPresShell,
  22                                     ComputedStyle* aStyle);
  23
  24   virtual FrameSearchResult PeekOffsetNoAmount(bool aForward,
  25                                                int32_t* aOffset) override;
  26   virtual FrameSearchResult PeekOffsetCharacter(
  27       bool aForward, int32_t* aOffset,
  28       PeekOffsetCharacterOptions aOptions =
  29           PeekOffsetCharacterOptions()) override;
  30   virtual FrameSearchResult PeekOffsetWord(
  31       bool aForward, bool aWordSelectEatSpace, bool aIsKeyboardSelect,
  32       int32_t* aOffset, PeekWordState* aState, bool aTrimSpaces) override;
  33
  34  protected:
  35   explicit WBRFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
  36       : nsIFrame(aStyle, aPresContext, kClassID) {}
  37 };
  38
  39 }  // namespace mozilla
  40
  41 nsIFrame* NS_NewWBRFrame(mozilla::PresShell* aPresShell,
  42                          ComputedStyle* aStyle) {
  43   return new (aPresShell) WBRFrame(aStyle, aPresShell->GetPresContext());
  44 }
  45
  46 NS_IMPL_FRAMEARENA_HELPERS(WBRFrame)
  47
  48 nsIFrame::FrameSearchResult WBRFrame::PeekOffsetNoAmount(bool aForward,
  49                                                          int32_t* aOffset) {
  50   NS_ASSERTION(aOffset && *aOffset <= 1, "aOffset out of range");
  51   // WBR frames can not contain text or non-rendered whitespace
  52   return CONTINUE;
  53 }
  54
  55 nsIFrame::FrameSearchResult WBRFrame::PeekOffsetCharacter(
  56     bool aForward, int32_t* aOffset, PeekOffsetCharacterOptions aOptions) {
  57   NS_ASSERTION(aOffset && *aOffset <= 1, "aOffset out of range");
  58   // WBR frames can not contain characters
  59   return CONTINUE;
  60 }
  61
  62 nsIFrame::FrameSearchResult WBRFrame::PeekOffsetWord(
  63     bool aForward, bool aWordSelectEatSpace, bool aIsKeyboardSelect,
  64     int32_t* aOffset, PeekWordState* aState, bool aTrimSpaces) {
  65   NS_ASSERTION(aOffset && *aOffset <= 1, "aOffset out of range");
  66   // WBR frames can never contain text so we'll never find a word inside them
  67   return CONTINUE;
  68 }